<div><b>{{player.username}}</b></div>
    <input v-model="room_id"></input>
    <button @click="createRoom">创建房间</button>
    <button @click="joinRoom">加入房间</button>
    <button>自由匹配</button>
    <br>
    <label for="player-number-1">
      <input name="player-number" id="player-number-1" v-model="player_number" :value="2" type="radio">
      两人
    </label>
    <label for="player-number-2">
      <input name="player-number" id="player-number-2" v-model="player_number" :value="3" type="radio">
      三人
    </label>
    <label for="player-number-3">
      <input name="player-number" id="player-number-3" v-model="player_number" :value="4" type="radio">
      四人
    </label>